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GAS BLOCK INSTRUCTION MANUAL
www.harrisproductsgroup.com
IMPORTANT - SAVE THESE INSTRUCTIONS
For your own safety, read these instructions. Failure to do so could lead to serious injury.
BE SURE THIS INFORMATION REACHES THE OPERATOR
Model Number: GB2 PN 4300943
Model Number: GB3 PN 4300944
GENERAL INSTRUCTIONS
These instructions and product are intended for EXPERIENCED oxy-fuel equipment operators or those working under the close supervision of skilled operators.
Operation and maintenance of welding and cutting equipment should conform to the provisions of American National Standard Z49.1, “Safety in Welding and
Cutting.” American Welding Society Manual C4.2-78 “Operator’s Manual for oxy-Fuel Gas Cutting” deserves careful study. If you are unfamiliar with the principle
of operation and safe practices for oxy-fuel gas equipment, you are urged to read the Recommended Practice for Safe oxy-Fuel Gas Cutting Torch Operation, AWS
Publication C4.2/C4.2M:2006 and/or The Harris instruction manual for Gas Welding, Cutting, Brazing and Heating (P/N 9505643).
DO NO permit untrained persons to install, operate or maintain this equipment. DO NOT attempt to install or operate this equipment until you have read and
understand these instructions. If you do not fully understand these instructions, contact your supplier for further information.
All gas flows should be COMPLETELY SHUT OFF when installing or servicing this equipment.
SAFETY: Comply with all safety precautions as listed below:
A. Use only the correct type hose connection for specific gas service as detailed below:
• For Acetylene, Propylene, Natural Gas and Propane use CGA No. 023, Class B, 9/16”-18 (LH), (F) nut – grooved connections.
• For Oxygen use CGA No. 022, Class B, 9/16”-18 (RH), (F) nut-smooth connections.
• For Inert Gases use 1/4” NPT or CGA No. 032, 5/8”-18 connections.
B. Test equipment for leaks regularly with approved leak detection solution or pressure loss method. The leak detection solution is available through your industrial
gas supplier.
C. Do not use equipment unless it is free from leaks, is operating properly and is being used as intended by the manufacturer.
D. Before lighting torch equipment, purge lines individually to eliminate any mixture of fuel gas in air or pure oxygen.
E. Avoid releasing uncontrolled, flammable gases or vapors near potential sources of ignition such as an open flame during set-up, operation and/or servicing. These
operations should always be done in a well ventilated area.
F. Do not use oil, or oil bearing materials, on or near devices through which oxygen flows. Oil, or any other combustible material, can ignite readily and burn
vigorously in the presence of oxygen. Use only lubricants and leak detection fluids compatible with oxygen.
1. INTRODUCTION
1.1 SCOPE
This manual provides installation and operation information for The Harris Products Group’s 2 and 3 Gas Block Automatic Flow Control Systems. The Gas Block is an
accessory recommended primarily for high volume production brazing, welding or heating applications. Both 2 and 3 Gas Block Systems are designed for oxy-fuel
or air-fuel torch equipment. The 3 Gas Block System includes an additional on/off control for an inert back-purging gas.
Model GB2 PN 4300943, Gas Block for Fuel Gas and Oxygen
Model GB3 PN 4300944, Gas Block for Fuel Gas, Oxygen and Inert Purging
